Make substitution types even if the substitution base isnt a type variable (#37348)
* Make substitution types even if the substitution base isnt a type variable * Broaden usage of getConditionalFlowTypeOfType to _all_ type lookups * Align comments
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db44231e38
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47b60ece0b
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@ -4278,7 +4278,7 @@ namespace ts {
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return createConditionalTypeNode(checkTypeNode, extendsTypeNode, trueTypeNode, falseTypeNode);
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}
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if (type.flags & TypeFlags.Substitution) {
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return typeToTypeNodeHelper((<SubstitutionType>type).typeVariable, context);
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return typeToTypeNodeHelper((<SubstitutionType>type).baseType, context);
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}
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return Debug.fail("Should be unreachable.");
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@ -11327,9 +11327,7 @@ namespace ts {
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// Get type from reference to named type that cannot be generic (enum or type parameter)
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const res = tryGetDeclaredTypeOfSymbol(symbol);
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if (res) {
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return checkNoTypeArguments(node, symbol) ?
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res.flags & TypeFlags.TypeParameter ? getConstrainedTypeVariable(<TypeParameter>res, node) : getRegularTypeOfLiteralType(res) :
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errorType;
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return checkNoTypeArguments(node, symbol) ? getRegularTypeOfLiteralType(res) : errorType;
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}
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if (symbol.flags & SymbolFlags.Value && isJSDocTypeReference(node)) {
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const jsdocType = getTypeFromJSDocValueReference(node, symbol);
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@ -11377,17 +11375,17 @@ namespace ts {
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return links.resolvedJSDocType;
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}
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function getSubstitutionType(typeVariable: TypeVariable, substitute: Type) {
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if (substitute.flags & TypeFlags.AnyOrUnknown || substitute === typeVariable) {
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return typeVariable;
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function getSubstitutionType(baseType: Type, substitute: Type) {
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if (substitute.flags & TypeFlags.AnyOrUnknown || substitute === baseType) {
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return baseType;
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}
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const id = `${getTypeId(typeVariable)}>${getTypeId(substitute)}`;
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const id = `${getTypeId(baseType)}>${getTypeId(substitute)}`;
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const cached = substitutionTypes.get(id);
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if (cached) {
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return cached;
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}
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const result = <SubstitutionType>createType(TypeFlags.Substitution);
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result.typeVariable = typeVariable;
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result.baseType = baseType;
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result.substitute = substitute;
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substitutionTypes.set(id, result);
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return result;
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@ -11397,25 +11395,25 @@ namespace ts {
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return node.kind === SyntaxKind.TupleType && (<TupleTypeNode>node).elementTypes.length === 1;
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}
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function getImpliedConstraint(typeVariable: TypeVariable, checkNode: TypeNode, extendsNode: TypeNode): Type | undefined {
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return isUnaryTupleTypeNode(checkNode) && isUnaryTupleTypeNode(extendsNode) ? getImpliedConstraint(typeVariable, (<TupleTypeNode>checkNode).elementTypes[0], (<TupleTypeNode>extendsNode).elementTypes[0]) :
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getActualTypeVariable(getTypeFromTypeNode(checkNode)) === typeVariable ? getTypeFromTypeNode(extendsNode) :
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function getImpliedConstraint(type: Type, checkNode: TypeNode, extendsNode: TypeNode): Type | undefined {
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return isUnaryTupleTypeNode(checkNode) && isUnaryTupleTypeNode(extendsNode) ? getImpliedConstraint(type, (<TupleTypeNode>checkNode).elementTypes[0], (<TupleTypeNode>extendsNode).elementTypes[0]) :
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getActualTypeVariable(getTypeFromTypeNode(checkNode)) === type ? getTypeFromTypeNode(extendsNode) :
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undefined;
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}
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function getConstrainedTypeVariable(typeVariable: TypeVariable, node: Node) {
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function getConditionalFlowTypeOfType(type: Type, node: Node) {
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let constraints: Type[] | undefined;
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while (node && !isStatement(node) && node.kind !== SyntaxKind.JSDocComment) {
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const parent = node.parent;
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if (parent.kind === SyntaxKind.ConditionalType && node === (<ConditionalTypeNode>parent).trueType) {
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const constraint = getImpliedConstraint(typeVariable, (<ConditionalTypeNode>parent).checkType, (<ConditionalTypeNode>parent).extendsType);
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const constraint = getImpliedConstraint(type, (<ConditionalTypeNode>parent).checkType, (<ConditionalTypeNode>parent).extendsType);
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if (constraint) {
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constraints = append(constraints, constraint);
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}
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}
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node = parent;
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}
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return constraints ? getSubstitutionType(typeVariable, getIntersectionType(append(constraints, typeVariable))) : typeVariable;
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return constraints ? getSubstitutionType(type, getIntersectionType(append(constraints, type))) : type;
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}
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function isJSDocTypeReference(node: Node): node is TypeReferenceNode {
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@ -12858,7 +12856,7 @@ namespace ts {
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links.resolvedType = resolved.flags & TypeFlags.IndexedAccess &&
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(<IndexedAccessType>resolved).objectType === objectType &&
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(<IndexedAccessType>resolved).indexType === indexType ?
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getConstrainedTypeVariable(<IndexedAccessType>resolved, node) : resolved;
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getConditionalFlowTypeOfType(resolved, node) : resolved;
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}
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return links.resolvedType;
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}
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@ -12880,7 +12878,7 @@ namespace ts {
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function getActualTypeVariable(type: Type): Type {
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if (type.flags & TypeFlags.Substitution) {
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return (<SubstitutionType>type).typeVariable;
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return (<SubstitutionType>type).baseType;
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}
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if (type.flags & TypeFlags.IndexedAccess && (
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(<IndexedAccessType>type).objectType.flags & TypeFlags.Substitution ||
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@ -13428,6 +13426,10 @@ namespace ts {
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}
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function getTypeFromTypeNode(node: TypeNode): Type {
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return getConditionalFlowTypeOfType(getTypeFromTypeNodeWorker(node), node);
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}
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function getTypeFromTypeNodeWorker(node: TypeNode): Type {
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switch (node.kind) {
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case SyntaxKind.AnyKeyword:
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case SyntaxKind.JSDocAllType:
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@ -13775,7 +13777,7 @@ namespace ts {
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return !!tp.isThisType;
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case SyntaxKind.Identifier:
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return !tp.isThisType && isPartOfTypeNode(node) && maybeTypeParameterReference(node) &&
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getTypeFromTypeNode(<TypeNode>node) === tp;
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getTypeFromTypeNodeWorker(<TypeNode>node) === tp; // use worker because we're looking for === equality
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case SyntaxKind.TypeQuery:
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return true;
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}
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@ -13976,7 +13978,7 @@ namespace ts {
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return getConditionalTypeInstantiation(<ConditionalType>type, combineTypeMappers((<ConditionalType>type).mapper, mapper));
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}
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if (flags & TypeFlags.Substitution) {
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const maybeVariable = instantiateType((<SubstitutionType>type).typeVariable, mapper);
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const maybeVariable = instantiateType((<SubstitutionType>type).baseType, mapper);
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if (maybeVariable.flags & TypeFlags.TypeVariable) {
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return getSubstitutionType(maybeVariable as TypeVariable, instantiateType((<SubstitutionType>type).substitute, mapper));
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}
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@ -14985,7 +14987,7 @@ namespace ts {
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const t = isFreshLiteralType(type) ? (<FreshableType>type).regularType :
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getObjectFlags(type) & ObjectFlags.Reference && (<TypeReference>type).node ? createTypeReference((<TypeReference>type).target, getTypeArguments(<TypeReference>type)) :
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type.flags & TypeFlags.UnionOrIntersection ? getReducedType(type) :
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type.flags & TypeFlags.Substitution ? writing ? (<SubstitutionType>type).typeVariable : (<SubstitutionType>type).substitute :
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type.flags & TypeFlags.Substitution ? writing ? (<SubstitutionType>type).baseType : (<SubstitutionType>type).substitute :
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type.flags & TypeFlags.Simplifiable ? getSimplifiedType(type, writing) :
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type;
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if (t === type) break;
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@ -4808,8 +4808,8 @@ namespace ts {
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// Thus, if Foo has a 'string' constraint on its type parameter, T will satisfy it. Substitution
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// types disappear upon instantiation (just like type parameters).
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export interface SubstitutionType extends InstantiableType {
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typeVariable: TypeVariable; // Target type variable
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substitute: Type; // Type to substitute for type parameter
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baseType: Type; // Target type
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substitute: Type; // Type to substitute for type parameter
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}
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/* @internal */
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@ -2523,7 +2523,7 @@ declare namespace ts {
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resolvedFalseType: Type;
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}
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export interface SubstitutionType extends InstantiableType {
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typeVariable: TypeVariable;
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baseType: Type;
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substitute: Type;
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}
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export enum SignatureKind {
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@ -2523,7 +2523,7 @@ declare namespace ts {
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resolvedFalseType: Type;
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}
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export interface SubstitutionType extends InstantiableType {
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typeVariable: TypeVariable;
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baseType: Type;
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substitute: Type;
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}
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export enum SignatureKind {
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@ -0,0 +1,29 @@
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//// [inlineConditionalHasSimilarAssignability.ts]
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type MyExtract<T, U> = T extends U ? T : never
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function foo<T>(a: T) {
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const b: Extract<any[], T> = 0 as any;
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a = b; // ok
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const c: (any[] extends T ? any[] : never) = 0 as any;
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a = c;
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const d: MyExtract<any[], T> = 0 as any;
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a = d; // ok
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type CustomType = any[] extends T ? any[] : never;
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const e: CustomType = 0 as any;
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a = e;
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}
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//// [inlineConditionalHasSimilarAssignability.js]
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function foo(a) {
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var b = 0;
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a = b; // ok
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var c = 0;
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a = c;
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var d = 0;
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a = d; // ok
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var e = 0;
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a = e;
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}
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@ -0,0 +1,53 @@
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=== tests/cases/compiler/inlineConditionalHasSimilarAssignability.ts ===
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type MyExtract<T, U> = T extends U ? T : never
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>MyExtract : Symbol(MyExtract, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 0))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 15))
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>U : Symbol(U, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 17))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 15))
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>U : Symbol(U, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 17))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 15))
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function foo<T>(a: T) {
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>foo : Symbol(foo, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 46))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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>a : Symbol(a, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 16))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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const b: Extract<any[], T> = 0 as any;
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>b : Symbol(b, Decl(inlineConditionalHasSimilarAssignability.ts, 3, 7))
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>Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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a = b; // ok
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>a : Symbol(a, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 16))
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>b : Symbol(b, Decl(inlineConditionalHasSimilarAssignability.ts, 3, 7))
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const c: (any[] extends T ? any[] : never) = 0 as any;
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>c : Symbol(c, Decl(inlineConditionalHasSimilarAssignability.ts, 6, 7))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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a = c;
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>a : Symbol(a, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 16))
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>c : Symbol(c, Decl(inlineConditionalHasSimilarAssignability.ts, 6, 7))
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const d: MyExtract<any[], T> = 0 as any;
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>d : Symbol(d, Decl(inlineConditionalHasSimilarAssignability.ts, 9, 7))
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>MyExtract : Symbol(MyExtract, Decl(inlineConditionalHasSimilarAssignability.ts, 0, 0))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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a = d; // ok
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>a : Symbol(a, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 16))
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>d : Symbol(d, Decl(inlineConditionalHasSimilarAssignability.ts, 9, 7))
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type CustomType = any[] extends T ? any[] : never;
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>CustomType : Symbol(CustomType, Decl(inlineConditionalHasSimilarAssignability.ts, 10, 8))
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>T : Symbol(T, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 13))
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const e: CustomType = 0 as any;
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>e : Symbol(e, Decl(inlineConditionalHasSimilarAssignability.ts, 13, 7))
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>CustomType : Symbol(CustomType, Decl(inlineConditionalHasSimilarAssignability.ts, 10, 8))
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a = e;
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>a : Symbol(a, Decl(inlineConditionalHasSimilarAssignability.ts, 2, 16))
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>e : Symbol(e, Decl(inlineConditionalHasSimilarAssignability.ts, 13, 7))
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}
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@ -0,0 +1,51 @@
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=== tests/cases/compiler/inlineConditionalHasSimilarAssignability.ts ===
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type MyExtract<T, U> = T extends U ? T : never
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>MyExtract : MyExtract<T, U>
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function foo<T>(a: T) {
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>foo : <T>(a: T) => void
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>a : T
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const b: Extract<any[], T> = 0 as any;
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>b : Extract<any[], T>
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>0 as any : any
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>0 : 0
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a = b; // ok
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>a = b : Extract<any[], T>
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>a : T
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>b : Extract<any[], T>
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const c: (any[] extends T ? any[] : never) = 0 as any;
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>c : any[] extends T ? any[] : never
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>0 as any : any
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>0 : 0
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a = c;
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>a = c : any[] extends T ? any[] : never
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>a : T
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>c : any[] extends T ? any[] : never
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const d: MyExtract<any[], T> = 0 as any;
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>d : MyExtract<any[], T>
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>0 as any : any
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>0 : 0
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a = d; // ok
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>a = d : MyExtract<any[], T>
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>a : T
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>d : MyExtract<any[], T>
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type CustomType = any[] extends T ? any[] : never;
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>CustomType : any[] extends T ? any[] : never
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const e: CustomType = 0 as any;
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>e : any[] extends T ? any[] : never
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>0 as any : any
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>0 : 0
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a = e;
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>a = e : any[] extends T ? any[] : never
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>a : T
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>e : any[] extends T ? any[] : never
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}
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@ -0,0 +1,16 @@
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type MyExtract<T, U> = T extends U ? T : never
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function foo<T>(a: T) {
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const b: Extract<any[], T> = 0 as any;
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a = b; // ok
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const c: (any[] extends T ? any[] : never) = 0 as any;
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a = c;
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const d: MyExtract<any[], T> = 0 as any;
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a = d; // ok
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type CustomType = any[] extends T ? any[] : never;
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const e: CustomType = 0 as any;
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a = e;
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}
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